For easy interfacing the 4 potentiometers two additional PCBs are available now, one
of them for potentiometers with push-button to change direction. Both PCBs offers
an USB/UART converter, using Microchip 16F1455, to provide a simple but efficient
USB access to firmware updates and allows saving and loading of turnouts routes,
as well as controlling / programming basic functions of 4 locos. These addional PCBs
simpilfies the wiring and offers each, beside the USB A connector, also two alternative
interfaces either for Flat (0...F) or Telephone (0..D,*,#) type keypads.